delphi – 防止XSLT转换将utf-8 XML转换为utf-16？

<?xml version="1.0" encoding="utf-8"?>

成

<?xml version="1.0" encoding="utf-16"?>

这是我从Exchange服务器返回的XML：

<?xml version="1.0" encoding="utf-8"?>
<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">
<s:Header>
<h:ServerVersionInfo MajorVersion="14" MinorVersion="0" MajorBuildNumber="722" MinorBuildNumber="0" Version="Exchange2010" xmlns:h="http://schemas.microsoft.com/exchange/services/2006/types" xmlns="http://schemas.microsoft.com/exchange/services/2006/types" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"/>
</s:Header>
<s:Body xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<m:ResolveNamesResponse xmlns:m="http://schemas.microsoft.com/exchange/services/2006/messages" xmlns:t="http://schemas.microsoft.com/exchange/services/2006/types">
<m:ResponseMessages>
<m:ResolveNamesResponseMessage ResponseClass="Success">
<m:ResponseCode>NoError</m:ResponseCode>
<m:ResolutionSet TotalItemsInView="1" IncludesLastItemInRange="true">
<t:Resolution>
<t:Mailbox>
<t:Name>developer</t:Name>
<t:EmailAddress>developer@timetellbv.nl</t:EmailAddress>
<t:RoutingType>SMTP</t:RoutingType>
<t:MailboxType>Mailbox</t:MailboxType>
</t:Mailbox>
<t:Contact>
<t:Culture>nl-NL</t:Culture>
<t:DisplayName>developer</t:DisplayName>
<t:GivenName>developer</t:GivenName>
<t:EmailAddresses>
<t:Entry Key="EmailAddress1">SMTP:developer@timetellbv.nl</t:Entry>
</t:EmailAddresses>
<t:ContactSource>ActiveDirectory</t:ContactSource>
</t:Contact>
</t:Resolution>
</m:ResolutionSet>
</m:ResolveNamesResponseMessage>
</m:ResponseMessages>
</m:ResolveNamesResponse>
</s:Body>
</s:Envelope>

这是删除命名空间信息的函数：

Uses
   MSXML2_TLB; // IXMLDOMdocument

class function TXMLHelper.RemoveNameSpaces(XMLString: String): String;
const
  // An XSLT script for removing the namespaces from any document.
  // From http://wiki.tei-c.org/index.php/Remove-Namespaces.xsl
  cRemoveNSTransform =
    '<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">' +
    '<xsl:output method="xml" indent="no"/>' +

    '<xsl:template match="/|comment()|processing-instruction()">' +
    '    <xsl:copy>' +
    '      <xsl:apply-templates/>' +
    '    </xsl:copy>' +
    '</xsl:template>' +

    '<xsl:template match="*">' +
    '    <xsl:element name="{local-name()}">' +
    '      <xsl:apply-templates select="@*|node()"/>' +
    '    </xsl:element>' +
    '</xsl:template>' +

    '<xsl:template match="@*">' +
    '    <xsl:attribute name="{local-name()}">' +
    '      <xsl:value-of select="."/>' +
    '    </xsl:attribute>' +
    '</xsl:template>' +

    '</xsl:stylesheet>';

var
  Doc,XSL: IXMLDOMdocument2;
begin
  Doc := ComsDOMDocument.Create;
  Doc.ASync := false;
  XSL := ComsDOMDocument.Create;
  XSL.ASync := false;
  try
     Doc.loadXML(XMLString);
     XSL.loadXML(cRemoveNSTransform);
     Result := Doc.TransFormNode(XSL);
  except
     on E:Exception do Result := E.Message;
  end;
end; { RemoveNameSpaces }

但在此之后,它突然变成了一个utf-16文件：

<?xml version="1.0" encoding="UTF-16"?>
<Envelope>
[snip]
</Envelope>

谷歌搜索“xsl utf-8 utf-16”后我尝试了几件事：

>更改线路(例如Output DataTable XML in UTF8 rather than UTF16)

<xsl:output method="xml" indent="no">

进入：

<xsl:output method="xml" encoding="utf-8" indent="no"/>
<xsl:output method="xml" encoding="utf-8"/>
<xsl:output encoding="utf-8"/>

那没用.
(这将是最佳解决方案,根据http://www.xml.com/pub/a/2002/09/04/xslt.html“编码属性实际上不仅仅是为结果文档添加编码声明;它告诉XSLT处理器使用该编码写出结果.”)
>更改线路(例如XslCompiledTransform uses UTF-16 encoding)

<xsl:output method="xml" indent="no"/>

成

<xsl:output method="xml" omit-xml-declaration="yes" indent="no" />

这会遗漏起始的xml标签,但如果我只是前置

<?xml version="1.0" encoding="utf-8"?>

我将丢失字符,因为没有进行实际的utf转换.
> IXMLDOMdocument2没有Encoding属性

任何想法如何解决这一问题？

备注/背景：

>如果所有其他方法都失败了,可能仍然可以选择将utf-16 XML数据更改为utf-8,但这是一种完全不同的方法.
>我正在尝试做所有utf-8,因为我通过EWS与Exchange服务器通信,并且将http请求标头设置为utf-16不起作用：Exchange告诉我内容类型’text / xml; charset = utf-16’不是预期的类型’text / xml; charset = utf-8′. EWS返回utf-8(见帖子的开头).